WO2013187269A1 - Dispositif de source d'alimentation de commutation - Google Patents

Dispositif de source d'alimentation de commutation Download PDF

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Publication number
WO2013187269A1
WO2013187269A1 PCT/JP2013/065319 JP2013065319W WO2013187269A1 WO 2013187269 A1 WO2013187269 A1 WO 2013187269A1 JP 2013065319 W JP2013065319 W JP 2013065319W WO 2013187269 A1 WO2013187269 A1 WO 2013187269A1
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WO
WIPO (PCT)
Prior art keywords
voltage
circuit
line
diode
drive
Prior art date
Application number
PCT/JP2013/065319
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English (en)
Japanese (ja)
Inventor
鵜野良之
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2014521267A priority Critical patent/JP5825433B2/ja
Priority to CN201380030522.XA priority patent/CN104350671B/zh
Publication of WO2013187269A1 publication Critical patent/WO2013187269A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Definitions

  • the present invention relates to a switching power supply device, and more particularly to a switching power supply device including a bootstrap circuit.
  • Patent Document 1 discloses a switching power supply device including a step-down converter. Since the switching element of the step-down converter is a high-side switching element in the circuit, it is necessary to generate a control voltage based on the potential side higher than the ground level for its control. A bootstrap circuit is provided.
  • Patent Document 2 in a circuit for supplying power to a load connected to the midpoint of two switching elements by alternately turning on and off two semiconductor switching elements in series at both ends of a DC power supply by a control signal.
  • a drive circuit using a bootstrap circuit is shown to supply power for driving a switching element connected to the high side of a DC power supply.
  • the capacitor of the bootstrap circuit is charged from the auxiliary power source via the diode.
  • an object of the present invention is to enable charging of the capacitor of the bootstrap circuit even when the input power supply off-period is short, and to enable switching control of the switch element at the start of operation after the off-period. It is an object of the present invention to provide a switching power supply device that can obtain an output voltage of 2.
  • a switching power supply drives a main current line connecting an input terminal and an output terminal, a step-down converter provided on the main current line, having an inductor, a switch element and a first diode, and the switch element
  • a driving circuit for applying a driving voltage to the driving circuit, a capacitor connected between the main current line and the driving voltage line, and an external control voltage input from the outside.
  • the bootstrap diode to be applied to the constant voltage, the voltage of the main current line as a reference, the constant voltage of the input voltage input from the input terminal, to supply a voltage lower than the external control voltage to the drive voltage line And a circuit.
  • the drive voltage based on the main current line is supplied to the drive circuit by the voltage charged in the capacitor of the bootstrap circuit, the voltage necessary for controlling the switch element can be obtained.
  • the potential of the drive voltage line is, for example, the ground potential, such as at the time of initial startup, the capacitor of the bootstrap circuit is charged by the external control voltage. At this time, since the voltage supplied from the constant voltage circuit is lower than the external control voltage, the capacitor of the bootstrap circuit is not charged from the constant voltage circuit.
  • the capacitor of the bootstrap circuit is charged with the external control voltage. Even at this time, since the voltage supplied by the constant voltage circuit is lower than the external control voltage, the capacitor is not charged from the constant voltage circuit. However, after that, when the main current line becomes a steady potential, the capacitor is already charged with the external control voltage, so even at this time, it is not charged from the constant voltage circuit. After that, when the switching power supply is temporarily stopped and the voltage between the output terminals is high (the voltage remains in the smoothing capacitor), the capacitor of the bootstrap circuit cannot be charged with the external control voltage. Since the voltage between the input terminals is higher than the voltage between the output terminals (since it is a step-down converter), the capacitor of the bootstrap circuit is charged by the constant voltage circuit using the main current line as a reference potential.
  • the main current is charged by a constant voltage from a constant voltage circuit using the line as a reference potential, and a driving voltage is applied to the driving circuit, thereby enabling restart. Since the constant voltage circuit does not operate during steady operation, there is no resistance loss in the constant voltage circuit during steady operation, and high efficiency can be achieved.
  • a collector and a base are connected to the input terminal, an emitter is connected to the drive voltage line, an anode is connected to the main current line, and a cathode is connected to the base of the transistor. It is preferable to have a Zener diode.
  • a stabilized constant voltage can be supplied to the drive voltage line with a circuit having a small number of parts.
  • the switching power supply device includes a second diode provided between the input terminal and the constant voltage circuit to prevent a backflow current from the constant voltage circuit.
  • the switching power supply device includes a fourth diode that is provided between the drive voltage line and the constant voltage circuit and prevents application of a reverse bias from the constant voltage circuit.
  • the step-down converter preferably has a configuration in which an LED is connected to the output side.
  • the LED can be reliably turned on even if the LED is turned on and off in a short time.
  • the capacitor of the bootstrap circuit can be charged to a predetermined driving voltage even when the switching power supply device is restarted for a short time after it has been temporarily stopped. For this reason, switching control of the switch element of the step-down converter can be reliably performed at the start of the operation of the switching power supply apparatus, and a desired output can be obtained.
  • FIG. 1 is a circuit diagram of a switching power supply device according to Embodiment 1.
  • FIG. FIG. 4 is a circuit diagram of a switching power supply device according to a second embodiment.
  • FIG. 1 is a circuit diagram of a switching power supply device according to the first embodiment.
  • the switching power supply device 101 steps down the input voltage Vi input from the input terminals Pi (+) and Pi ( ⁇ ) by a step-down converter, and outputs it from the output terminals Po (+) and Po ( ⁇ ).
  • the voltage Vo is output.
  • a DC voltage source E is connected to the input terminals Pi (+) and Pi ( ⁇ ).
  • a constant current driven load such as an LED is connected to the output terminals Po (+) and Po ( ⁇ ).
  • a line connecting the input terminal Pi (+) and the output terminal Po (+) is referred to as a main current line 41.
  • the step-down converter of the switching power supply apparatus 101 includes an n-type MOS-FET (hereinafter referred to as FET) 11, an inductor L1, and a diode D1.
  • FET n-type MOS-FET
  • L1 inductor
  • D1 diode
  • the FET 11 and the inductor L1 are connected in series and provided in the main current line 41. More specifically, the drain of the FET 11 is connected to the input terminal Pi (+), and the source is connected to the output terminal Po (+) via the inductor L1.
  • the cathode of the diode D1 is connected to the connection point of the FET 11 and the inductor L1, and the anode is connected to a ground line connecting the input terminal Pi ( ⁇ ) and the output terminal Po ( ⁇ ).
  • the switching power supply apparatus 101 includes a drive circuit 30, a level shift circuit 31, and a control circuit 32.
  • the drive circuit 30 corresponds to the drive circuit of the present invention.
  • control circuit 32 detects the output current via a resistor (not shown) provided on the ground line and shifts the level of a drive signal for switching the FET 11 so that a predetermined output current Io is obtained. Output to the circuit 31.
  • the control circuit 32 operates with an external control voltage Vcc input through the external power supply line 43.
  • the external power supply line 43 is connected to a decoupling capacitor or a capacitor C2 as a smoothing capacitor.
  • the level shift circuit 31 performs level shift of the drive signal output from the control circuit 32 and outputs it to the drive circuit 30.
  • the drive circuit 30 performs switching control of the FET 11 based on the drive signal level-shifted by the level shift circuit 31. At this time, the drive circuit 30 raises the voltage level of the drive signal by the bootstrap circuit 10 and applies it to the gate of the FET 11. A drive voltage is supplied from the bootstrap circuit 10 to the drive circuit 30 through the drive voltage line 42.
  • the bootstrap circuit 10 has a capacitor C1 and a bootstrap diode D2.
  • the capacitor C ⁇ b> 1 is connected between the drive voltage line 42 and the main current line 41.
  • the bootstrap diode D ⁇ b> 2 has a cathode connected to the drive voltage line 42 and an anode connected to the external power supply line 43.
  • the switching power supply device 101 includes a constant voltage circuit 20 that converts the input voltage Vi to a constant voltage Vb and supplies the input voltage Vi to the drive voltage line 42 with the potential of the main current line 41 as a reference.
  • the constant voltage circuit 20 includes a resistor R1, a transistor 12, and a Zener diode Dz.
  • the transistor 12 has a base connected to the input terminal Pi (+) via the resistor R1, a collector connected to the input terminal Pi (+), and an emitter connected to the drive voltage line 42.
  • the Zener diode Dz has a Zener voltage substantially equal to the constant voltage Vb, an anode connected to the main current line 41, and a cathode connected to the base of the transistor 12.
  • the external control voltage Vcc is set higher than the Zener voltage (constant voltage Vb) of the Zener diode Dz of the constant voltage circuit 20.
  • the input voltage Vi is 80V
  • the output voltage Vo is 50V
  • the external control voltage Vcc is 15V
  • the constant voltage Vb is 12V.
  • the cathode potential of the diode D1 in the main current line 41 which is the reference potential for charging the capacitor C1 varies depending on the on / off state of the FET 11. For example, when the FET 11 is on, the cathode potential of the diode D1 is Vin (80V), and when the FET 11 is off, the cathode potential of the diode D1 is almost the ground potential.
  • the capacitor C1 is charged with the external control voltage Vcc of 15V through the path A passing from the external power supply line 43 through the bootstrap diode D2.
  • the capacitor C1 is not charged from the constant voltage Vb of 12V by the constant voltage circuit 20.
  • the drive circuit 30 can apply the drive voltage between the gate and source of the FET 11, and the FET 11 can be reliably switched.
  • the switching power supply device 101 stops operating and restarts in a short off period, the charge of the capacitor Co may not be completely discharged and the charge may remain in the capacitor Co.
  • the load has a diode characteristic such as an LED, current does not flow unless a voltage higher than a certain level is applied, so that the capacitor Co is difficult to discharge. Therefore, for example, when the potential of the main current line 41 is 13 V, the external power supply line 43 has substantially the same potential as the main current line 41 and the drive voltage line 42. In this case, the bootstrap diode D2 becomes non-conductive until there is no remaining charge in the capacitor Co, and the capacitor C1 is not charged by the external control voltage Vcc.
  • the transistor 12 operates at a potential higher by a Zener voltage (12 V of the constant voltage Vb) with the main current line 41 as a reference potential during the off-period of the FET 11. To do. For this reason, the transistor 12 of the constant voltage circuit 20 operates, and the constant voltage Vb of 12V after the constant voltage of the input voltage Vi of 80V is passed through the capacitor C1 from the transistor 12 and the capacitor C1 has a constant voltage of 12V. The voltage Vb is charged.
  • the drive circuit 30 can stably switch the FET 11.
  • the capacitor C1 is constantly charged with the constant voltage Vb after the constant voltage by the constant voltage circuit 20, a resistance loss occurs in the constant voltage circuit 20.
  • the capacitor C1 is charged from the external control voltage Vcc higher than the voltage after the constant voltage by the constant voltage circuit 20, so the constant voltage circuit 20 does not operate and the resistance loss is reduced. it can.
  • FIG. 2 is a circuit diagram of the switching power supply device according to the second embodiment.
  • the switching power supply apparatus 102 according to the present embodiment has the same basic circuit configuration as that of the first embodiment. Hereinafter, differences from the first embodiment will be described.
  • a diode (second diode of the present invention) D3 and a resistor R2 are provided between the input terminal Pi (+) and the constant voltage circuit 20.
  • the diode D3 has an anode connected to the input terminal Pi (+) and a cathode connected to the base of the transistor 12 via the resistor R2 and the resistor R1.
  • the collector of the transistor 12 is connected to the resistor R2 through the resistor R3.
  • a resistor R4 is connected in series to the bootstrap diode D2 of the bootstrap circuit 10.
  • a diode (a third diode of the present invention) D4 is provided between the emitter of the transistor 12 and the drive voltage line.
  • the diode D3 is intended to prevent a reverse bias from being applied to the constant voltage circuit 20.
  • the input terminal Pi (+) and the cathode of the diode D1 are at the same potential due to the action of the body diode of the FET 11, but when the charge remains in the capacitor C1, the constant voltage circuit A reverse bias is applied to.
  • the diode D3 it is possible to prevent destruction between the base and the emitter of the transistor 12 due to the reverse bias voltage.
  • the resistors R2, R3, and R4 are elements for preventing overcurrent, and the destruction of each element can be prevented.
  • the diode D4 prevents a reverse bias from being applied to the constant voltage circuit 20.
  • the external control voltage Vcc is set to be higher than the Zener voltage (constant voltage Vb) of the Zener diode Dz of the constant voltage circuit 20, and therefore, a reverse bias is applied between the base and emitter of the transistor 12. Applied.
  • Vb constant voltage
  • the diode D4 it is possible to prevent the base 12 and the emitter of the transistor 12 from being destroyed by the reverse bias voltage.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)

Abstract

La présente invention concerne un dispositif de source d'alimentation de commutation comprenant : un convertisseur abaisseur de tension pour une ligne de courant principale (41) et ayant une inductance (L1), un FET (11), et une diode (D1) ; un circuit de pilotage (30) pour piloter le FET (11) ; une ligne de tension de pilotage (42) pour appliquer et transmettre une tension de pilotage devant être appliquée à un circuit de pilotage (30) ; un condensateur (C1) connecté entre la ligne de courant principale (41) et la ligne de tension de pilotage (42) ; un circuit à tension constante (20) pour rendre constante une tension d'entrée et fournir la tension à la ligne de tension de pilotage (42) avec le potentiel électrique de la ligne de courant principale (41) comme référence ; et une diode d'amorçage (D2) pour appliquer et transmettre à la ligne de tension de pilotage (42) une tension commandée de manière externe qui est plus élevée que la tension rendue constante par le circuit à tension constante (20). Un dispositif de source d'alimentation de commutation est ainsi fourni, dans lequel une commande de commutation d'un élément de commutation à un démarrage de fonctionnement est réalisée de manière fiable et la tension de sortie désirée est obtenue même lorsque l'intervalle de temps durant lequel une source d'alimentation d'entrée est éteinte est court.
PCT/JP2013/065319 2012-06-11 2013-06-03 Dispositif de source d'alimentation de commutation WO2013187269A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2014521267A JP5825433B2 (ja) 2012-06-11 2013-06-03 スイッチング電源装置
CN201380030522.XA CN104350671B (zh) 2012-06-11 2013-06-03 开关转换电源装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-131461 2012-06-11
JP2012131461 2012-06-11

Publications (1)

Publication Number Publication Date
WO2013187269A1 true WO2013187269A1 (fr) 2013-12-19

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JP (1) JP5825433B2 (fr)
CN (1) CN104350671B (fr)
WO (1) WO2013187269A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015153473A (ja) * 2014-02-10 2015-08-24 三菱電機株式会社 点灯装置および照明器具
JP2015154682A (ja) * 2014-02-19 2015-08-24 サンケン電気株式会社 Ｄｃ／ｄｃコンバータ
JP2017200326A (ja) * 2016-04-27 2017-11-02 パナソニックＩｐマネジメント株式会社 電源装置及び照明装置
JP2018064317A (ja) * 2016-10-11 2018-04-19 コーセル株式会社 スイッチング電源装置
WO2020247021A1 (fr) * 2019-06-06 2020-12-10 Microchip Technology Incorporated Régulateur de commutation basse puissance non isolé auto-polarisé

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05304768A (ja) * 1992-02-25 1993-11-16 Yutaka Denki Seisakusho:Kk Ｄｃ−ｄｃコンバータ
JPH10215568A (ja) * 1997-01-29 1998-08-11 Murata Mfg Co Ltd Ｄｃ−ｄｃコンバータ
JP2002025790A (ja) * 2000-07-12 2002-01-25 Koito Mfg Co Ltd 放電灯点灯回路
JP2005304226A (ja) * 2004-04-14 2005-10-27 Renesas Technology Corp 電源ドライバ回路及びスイッチング電源装置
JP2009095214A (ja) * 2007-10-12 2009-04-30 Sony Corp Ｄｃ−ｄｃコンバータ回路
JP2010136532A (ja) * 2008-12-04 2010-06-17 Sharp Corp スイッチング電源回路及びそれを用いた電子機器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3750690B1 (ja) * 2005-02-15 2006-03-01 株式会社村田製作所 電源装置
JP5182375B2 (ja) * 2009-05-15 2013-04-17 株式会社村田製作所 Ｐｆｃコンバータ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05304768A (ja) * 1992-02-25 1993-11-16 Yutaka Denki Seisakusho:Kk Ｄｃ−ｄｃコンバータ
JPH10215568A (ja) * 1997-01-29 1998-08-11 Murata Mfg Co Ltd Ｄｃ−ｄｃコンバータ
JP2002025790A (ja) * 2000-07-12 2002-01-25 Koito Mfg Co Ltd 放電灯点灯回路
JP2005304226A (ja) * 2004-04-14 2005-10-27 Renesas Technology Corp 電源ドライバ回路及びスイッチング電源装置
JP2009095214A (ja) * 2007-10-12 2009-04-30 Sony Corp Ｄｃ−ｄｃコンバータ回路
JP2010136532A (ja) * 2008-12-04 2010-06-17 Sharp Corp スイッチング電源回路及びそれを用いた電子機器

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015153473A (ja) * 2014-02-10 2015-08-24 三菱電機株式会社 点灯装置および照明器具
JP2015154682A (ja) * 2014-02-19 2015-08-24 サンケン電気株式会社 Ｄｃ／ｄｃコンバータ
JP2017200326A (ja) * 2016-04-27 2017-11-02 パナソニックＩｐマネジメント株式会社 電源装置及び照明装置
JP2018064317A (ja) * 2016-10-11 2018-04-19 コーセル株式会社 スイッチング電源装置
WO2020247021A1 (fr) * 2019-06-06 2020-12-10 Microchip Technology Incorporated Régulateur de commutation basse puissance non isolé auto-polarisé
CN113939984A (zh) * 2019-06-06 2022-01-14 微芯片技术股份有限公司 自偏置非隔离低功率开关调节器
CN113939984B (zh) * 2019-06-06 2024-03-19 微芯片技术股份有限公司 自偏置非隔离低功率开关调节器

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Publication number Publication date
JPWO2013187269A1 (ja) 2016-02-04
JP5825433B2 (ja) 2015-12-02
CN104350671A (zh) 2015-02-11
CN104350671B (zh) 2017-03-29

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